I have Doug Thorley headers on my '71 Camaro, and I can pull a starter and replace it without moving anything. I had the first set of Doug's headers on the car from 1974 until this year, and just replaced them with another set of Doug's headers, and they fit equally well.

Lucky you.

These Hooker Comps I have make the power, but they are all over the place. The left side is great, but the right side header is in the way of everything.